Large multicystic pulmonary chondroid hamartoma in a child presenting as pneumothorax

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Figure 1
Computed tomography scan of the multicystic pulmonary hamartoma showing: A) Axial cut demonstrates a large multiseptate cystic lesion in the right hemithorax (arrow), some of the cysts are air filled while others are fluid filled. This lesion shows mass effect upon adjacent mediastinum. B) Coronal image shows the multilocular nature of this cystic lesion (arrow), and its effect upon the adjacent lung tissue and the pneumothorax.
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Figure 2
Photomicrograph of the multicystic pulmonary hamartoma showing: A) A mass composed of numerous microcystic spaces (arrow) with multiple micronodules (arrowhead) in the wall of the microcysts. (Hematoxylin and Eosin stain; original magnification ×20). B) The micronodules are lined by benign flattened to cuboidal epithelial cells. The micronodules are composed of hyaline cartilage (arrow), fibrous tissue, and adipose tissue (arrowhead). There is no pleomorphism, abnormal mitosis or necrosis in the any of the cartilaginous, fibrous, or adipocytic mesenchymal elements (Hematoxylin and Eosin stain; original magnification ×40).